Yep, they have one. 1986 and older has a two piece rear main seal. 1987 and up has a one piece rear main seal.
The job of the rear main seal is to keep the oil lubricating the rear main bearing from leaking out. Older model rear main seals were made from a "rope" type of material. Today the rear main seal is a one or two piece seal made from neoprene rubber and is located directly behind the rearmost main bearing journal of the crankshaft.
pull trans. fly wheel one piece rear main seal not a job for a shade tree
replace it with a new one
That engine has a solid round one piece rear main seal that slides over the rear of the crankshaft. You will either have to remove the engine are transmission to be able to replace the rear seal. No other way to do it. ( BIG JOB ) and a good paying job.
remove the transmission pry the old seal out and install the new one. piece of cake
There is one on each end of the crankshaft. The front main seal is at the pulley and, while the rear main is at the transmission end.
Two
1986
two
The 1990 block would have the integrated one-piece rear main seal. Oil pan and crankshaft are not interchangeable.
its one